Gas-pressure gage.



W. THOMAS. GAS PRESSURE GAGE. APPLIMTION ULEB mi 14. 190s.

Patented Feb. 23, 1909.

' admitted to the tube, and my object 'ignge of that class wherein the evel of water or other medium in a U tube PATENT OFFI (1E.

WALTER THOMAS, OF VANCOUVER, BRITISH COLUMBIA, CANADA.

oAs-rnnsstmn GAGE.

Specification o! Letters Patent. i

Patented Feb. 23, 1909.

Appleman and my 14, im( sum No. 432,917.

To allaoiwm. it mwy concern: V

Be ity known that I, WALTER THOMAS, a

lcitizen of the Dominion of Canada, residing at Vancouver, in the Province of British Columbia, Canada, have invented a new und useful Improvement in` Gas- Pressure (ages,o which the following is a specification.

This invention relates to a as pressure iference 1n is used to determine the pressure of the as as been. to rovide n means whereby glas from two difierent sourcesl may be admitted to the opposite sidesl of the U tube, that the difference Ofpressure may be ascertained;

or tlie.`gas fromA one or the otler source may be admitted to either one orthe other side ofthe U tube while the opposite side is opened to the atmosphere, that the pressure from either source may be determined.

The invention is fully described in thc following specification, rcterencebeinguiada to the drawings by whichA it is accouumnied,

` in which Figure l is a front elevation of the ga fe, Figs. 2 and 3, sections of the. head va ve parallel to the front showing the valve in two positions and, Fig. 4, :i vertical section of the same on the liuc A A in Fig. l.

zero point or water level.

' usual manner which it is required to determine the pressure, they are connected to two ports 4 and 5 of a valve body 7 which is bored slightly conical to receive a rotatable valve plug 8 retaincd'within the body 7 by a screw 6 at the back.V

()n each side of the valve body 7 are gas admission ports 9jand 10 at a distance from the ports 4 and 5, to which the ends of the U tube are connected, corresponding to the distance between these ports, an between the U tube connections 4 and 5 and the apertures 9 and 10 are small apertures 11` direct to the atmosphere.

The rotatable `valve plug 8 is provided as shown in4 Fig, 1 of the drawing, will connect the gas admission ports 9 and 1U to the U tube ports 4 and 5; and between the upper ends of the ports 1Q is a V port 13, the distance between the ends of which corresponds to the distance between the U tubo connection ports 4 or 5 and their respective atmospheric apertures 1l on each si( e.

The location of the Yports in the valve body and plug just describe(J may be indicated by lines or color on the exposed front face of each and the various positions of the plug may be further indicated by a liuc 14 on the plug and lines 15, 16 and 17 on the face of the body. Y

The operation of the device is as follows: then the valve lug 8 is turned to the position shown in 41ig. l with the indicating;J lint` 14 ofthe lug in liuc with the inai'lt i3 of the body, t e ports 12 of the plugr will connect the inlet ports Qand 'l0 of the body respectively with 4 and 5 of the U tube and` eating line 14 to the mark 16 as represented in Fi S2, the inlet 10 will be i'connccted by one o the ports l2 to one side 5 of the U "tube While the port 13 will admit the atmospheric pressure from l1 to the other port 4 of the U tube, and the page will indicate the gas pressure admitte at i0. Similarly when the indicating,r pointer 14, as in Fig. 3, is turned to the niark 17 the other inlet 9 will be connected to the other port 4 of the UV tube and the atmosphere will be admitted through '13 to the opposite side through the port 5. Thus practically three gages are combined in one y' a simple and effective device q vhich may without diflt culty be ap liedto any existing age, for the ports 4 an 5 may be connecte( to the ends of an existing U tube by short lengths of rubber tube.

Having now particularly described my 1n vcntion and the manner of its use, I hereby 4declare that what I claim as new end desirc to be protected in by Letters Patent, is:

1. In a gas pressure gage, in combination with a U tube fiuid pressure gage, oI means for eimultaneously admitting gas from two diiferent sources of Supply to the opposite ends of the U tube, Said meansalso meludn ing provisions for admitting gus from either,

source of supply to one or the other side of lh `Litube und eiinuiteneously opening one Hi e of the U tube to the atmosphere.

21. In a. gas pressure gage,` tite combination with n U tube fluid pressure gage, of a valve the bod of which is provided with orts to whieh t Ye ends of the U tube may oonueote! and ports to which gas from two dipf ferent sources of su piy nui be admitted end sorts between t ese to t e atmosphere the plug of seid valve having ports that will when in one ositon connect the gas su ply ports to the Ii] tube ports and that Wil in other positions connect one or the other of the gas suppl orts to one or th'ebther U tube ports w i e connecting the other U tube port to the atmosphere port.

3. In a gas pressure gage of the class described, the combination with a U tube Huid preure gage, of a valve b havin ports to which the ends of the U tube may e oonnected und ports to which gas from two different sources of suppy may be admitted, :t valve plug fitting eel body and having o port on each side connecting each gas supply 1 pgrt with each U tube port, a port 1n the dy between each U tnbe port and each gas supply port and a port` in the valve p ug which when the plug'is'-turned to connect one of the gas Supply ports to one of the U tube ports will connect` the other U tube port to the atmosphere through the port therefor in the body.

In testimony whereof 1 have signed my neme to this specification in the presence of two subscribing witnesses.

WALTER THOMAS.

Witnesses ROWLAND BRITTAIN, Cuve` S` CARMAN. 

